Word: eye
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Dates: during 1880-1889
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...beginning of the microscope of to-day is traceable to the small, single lens instrument of the sixteenth century, called at the time Vita pulicaria, or flea-glass, because by its aid the true beauty of the flea, in outline and detail, was first brought clearly before the public eye. Aside from the great advantage accruing to mankind from a just appreciation of the flea, the learned men of the time declared that, with this wonderful machine, they had discovered many new monsters; and one savant affirmed that he had seen the devil himself...
...independence of a microscopist from an elaborate stand arises from the fact that the true value of his work is due to his experience and the magnifying power of the lenses which he uses. The objective, or system of lenses nearest the object, and ocular or system nearest the eye, are the two parts upon which this magnifying power depends, the burden of the work always being put upon the objective...
...this country and in England the objectives and oculars are named in inches or fractions of an inch, relatively to the focal length of a simple lens which will produce the same magnification. Thus taking the focal length of the eye as ten inches, a one inch objective magnifies ten diameters, a 1-50 inch objective, five hundred diameters; a 1-100 objective, one thousand diameters; (the highest powers made). When the ocular system is added, the magnification is equal to the product of the magnifying powers of the objective times the ocular. For instance, a two inch vocular...
There was early an idea that the action of many supernatural forces would be discovered by the powerful eye of the microscope; and the microscopist of the last century was regarded, by his servants and others, as somehow in league with that devil, whose discovery was due to the savant and the humble "flea glass" of the century before...
Lost. - In the gymnasium a few days ago, a pair of eye glasses in a case. The finder will please return them to the gymnasium office...